CN2907005Y

CN2907005Y - Spark plug utilizing DC high voltage breakdown for ignition

Info

Publication number: CN2907005Y
Application number: CN 200620058913
Authority: CN
Inventors: 覃政财
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-05-16
Filing date: 2006-05-16
Publication date: 2007-05-30
Anticipated expiration: 2016-05-16

Abstract

The utility model relates to the spark plug technology field, in particular to a DC high voltage voltage-breakdown ignition spark plug, which comprises a shell, an insulator, a center electrode and a conductor; wherein the insulator is dowel joint with the shell and the center electrode and the conductor are arranged in the center of the insulator; the conductor glass is electrically connected with the center electrode and the conductor; the other end of the center electrode extends to the lower end of the insulator; the spark plug of the utility model has the advantages of long ignition time, stronger sparks, high burning rate, more complete combustion and less exhaust pollution, more environmental protection, smaller best spark advance angle and big output power.

Description

A kind of spark plug of dc high-voltage voltage breakdown igniting

Technical field:

The utility model relates to the spark plug technology field, refers in particular to a kind of spark plug of dc high-voltage voltage breakdown igniting.

Background technology:

At present in the ignition system of internal combustion engine, classical ignition system, the solid-state ignition system Microcomputer-Controlled Ignition System of unifying is arranged, in Microcomputer-Controlled Ignition System, signal generator for ignition is discerned each cylinder compression top center and is given ECU with the signal that obtains, ECU receives the signal that other transducer sends simultaneously and carries out COMPREHENSIVE CALCULATING, thereby obtain ignition signal, the conducting and the disconnection of this signal elementary winding of control ignition coil after amplifying, thereby produce the igniting high-tension electricity at secondary winding, i.e. the discharge igniting fuel in the cylinder that ignites.Engine by spark ignition after, the burning of gaseous mixture at first is through igniting induction period, and then enter the fierce burning phase, be that gaseous mixture is not instantaneous at the engine air in-cylinder combustion, but need the regular hour, therefore, the igniting of gaseous mixture has an optimum igniting advance angle, yet at present the igniting of fire point plug is instantaneous ignition, and there is following defective in this technology: 1, the duration of ignition short, fuel can not fully burn; High-tension electricity electric current instability when 2, lighting a fire, it is little to produce electric arc, and spark is little; 3, the mixture combustion time is long; 4, optimum igniting advance angle angle changes greatly; 5, can not send maximum power.

The utility model content:

The purpose of this utility model be at the deficiencies in the prior art provide a kind of simple in structure, duration of ignition long, spark is strong, can make full combustion of fuel, improve the spark plug of the dc high-voltage voltage breakdown igniting of power output.

For achieving the above object, the utility model is achieved through the following technical solutions: it comprises the body shell, insulator, the lower end outer rim of body shell forms thread, insulator is socketed on the body shell, it is characterized in that: described spark plug also comprises central electrode and electric conductor, central electrode and electric conductor are installed on the insulator center, also be provided with a conductor glass in the described insulator, the two ends of conductor glass electrically connect with central electrode and electric conductor respectively, the other end of central electrode then extends to the insulator lower end, the both positive and negative polarity of DC high-voltage power supply respectively with central electrode and cylinder on piston electrode electrically connect.

Described piston electrode is the metal electrode that is installed on piston face and cooperates with central electrode.

The bottom portion that described insulator is equipped with central electrode forms at least one circle flange.

The end that described insulator and DC high-voltage power supply electrically connect is provided with connector lug and sealing ring.

Described insulator is provided with inner washer and sealing ring, and inner washer and sealing ring are installed on the socket place of insulator and body shell respectively.

The central electrode of spark plug of the present utility model is installed on the insulator center and electrically connects with the positive pole of DC high-voltage power supply, the negative electrode of DC high-voltage power supply then is electrically connected on cylinder or the piston, it is breakdown current can occur in the air pressure of utilizing high direct voltage voltage certain, temperature, the distance range, produces electric arc and lights this principle of combustion mixture and make; When piston move to from the central electrode of spark plug distance less than default voltage breakdown apart from the time, between central electrode and piston, promptly produce electric arc, the electric spark that is produced is lighted combustion mixture, makes the combustion mixture burning.In sum, the utlity model has following advantage:

1, at piston electrode distance center electrode during less than default arcing distance, the living arc ignition that then do not stop production between the central electrode of spark plug and the piston electrode, the duration of ignition is long, and electric spark was strong when this kind method was lighted a fire;

2, during plug ignition, light gaseous mixture from electric spark and enter the inducing combustion phase to the fierce burning phase, the auxiliary combustion mixture burning of the living electric arc that do not stop production between the central electrode of spark plug and the piston electrode, the speed of mixture combustion is faster than the burning rate of other method igniting, and it is more complete to burn;

The electric spark that is produced when 3, piston moves to the top dead centre place is the strongest, and auxiliary gaseous mixture is in fierce burning phase burning, and it is more abundant to burn, and discharge tail gas is polluted still less, environmental protection more;

4, the optimum igniting advance angle is littler than the optimum igniting advance angle of using other method igniting, improves power output.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model

Accompanying drawing 2 is that spark plug of the present utility model is inserted in the structural representation on the cylinder

Accompanying drawing 3 is the circuit theory diagrams of dc high-voltage voltage breakdown ignition system of the present utility model

Embodiment:

Embodiment sees accompanying drawing 1,2,3, it comprises body shell 1, insulator 2, central electrode 3 and electric conductor 4, electric conductor 4 is a conductive metal sheet, body shell 1 lower end outer rim forms thread 5, spark plug is spirally connected by thread 5 and is fixed on the cylinder 21, described insulator 2 is socketed on the body shell 1, central electrode 3 and electric conductor 4 are installed on the center of insulator 2, also be provided with a conductor glass 6 in the described insulator 2, the end that electric conductor 4 and central electrode 3 are positioned at insulator 2 inside spiral respectively is connected on the conductor glass 6, conductor glass 6 electrically connects electric conductor 4 and central electrode 3 get up, conductor glass 6 seals to spark plug simultaneously, prevents that gaseous mixture from going out by the clearance leakage between central electrode 3 and the insulator 2.

The other end of described central electrode 3 then extends to 7 places, lower end of insulator 2 and protrudes slightly, to make things convenient for the cooperation between central electrode 3 and the piston electrode 9, breakdown current takes place, produce electric arc, insulator 2 bottom herein forms two circle flanges 12, flange 12 can effectively prevent other part discharge beyond 3 pairs of cylinder walls of central electrode or the piston electrode 9, avoids the spark plug igniting that meets accident.

Described central electrode 3 cooperates with piston electrode 9, and both constitute pair of discharge electrodes, piston electrode 9 for be installed on piston face 20 and with central electrode 3 corresponding metal electrodes.

The end of described insulator 2 is provided with connector lug 8, connector lug 8 electrically connects with electric conductor 4, electric conductor 4 electrically connects by the positive pole of connector lug 8 with DC high-voltage power supply, the negative pole of DC high-voltage power supply then electrically connects with cylinder block 21, because cylinder block and piston electrically conduct, therefore, the negative pole of DC high-voltage power supply be equivalent to piston on piston electrode 9 electrically connect.

Described insulator 2 is provided with inner washer 11 and multi-layer sealed circle, and inner washer 11 and sealing ring are installed on the socket place of insulator 2 and body shell 1 respectively, and inner washer 11 and sealing ring can effectively prevent its gas leakage.

When spark plug of the present utility model is worked, can add one on the central electrode 3 of spark plug and cylinder block 21 when internal combustion engine can adjust and stable high direct voltage piezoelectric voltage at any time, piston and cylinder block 21 electrically conduct, and the negative pole that then is equivalent to DC high-voltage power supply is electrically connected to the piston electrode 9 on the piston.The process that piston moves from lower dead center toward top dead centre, when piston soon arrives top dead centre, when piston electrode 9 is less than or equal to the striking distance of high direct voltage piezoelectric voltage apart from the distance of the central electrode 3 of spark plug, breakdown current takes place between central electrode 3 and the piston electrode 9, produce electric arc, plug ignition; Cross top dead centre also in the process of lower dead center motion at piston, piston electrode 9 begins to become big with the distance of the central electrode 3 of spark plug, when its distance during greater than the striking distance of high direct voltage piezoelectric voltage, then can't produce breakdown current between central electrode 3 and the piston electrode 9, can't produce arc ignition, igniting finishes.

The igniting of spark plug is divided into two kinds of effective igniting and invalid igniting.Wherein, effectively igniting is piston compresses burning mixture from lower dead center toward the top dead centre direction process, when piston moves in the striking distance of high direct voltage piezoelectric voltage, high direct voltage piezoelectric voltage generation breakdown current, produce electric arc, light gaseous mixture, gaseous mixture enters leads the combustion phase, enter the fierce obviously burning phase after gaseous mixture is lighted, at this moment, the central electrode 3 on the spark plug still is within effective striking distance of high direct voltage piezoelectric voltage with the distance of piston electrode 9, therefore, still continue to produce electric arc between central electrode 3 and the piston electrode 9, connect igniting, make mixture combustion more abundant, burning rate is faster, outside piston moved to the striking distance of high direct voltage piezoelectric voltage, so far, spark plug stopped igniting; Invalid igniting is waste gas compression from lower dead center toward the top dead centre direction at piston, carry out in the process of exhaust, piston electrode 9 enters in effective striking distance of high direct voltage piezoelectric voltage, produce electric arc between the central electrode 3 of spark plug and the piston electrode 9, invalid igniting begins, at this moment inlet valve begins to open, because the waste gas in the cylinder still has certain pressure, certain negative pressure is arranged in the air inlet pipe, therefore in some toxic emission air inlet pipe, then piston is crossed top dead centre and is begun at this moment, to still have certain negative pressure in the air inlet pipe toward the motion of lower dead center direction, when piston continues to move downward air pressure to cylinder when pressure in the air inlet pipe equates, air inlet pipe just begins air inlet, and what at first enter cylinder is the waste gas that is discharged into air inlet pipe in the exhaust process, at this moment, piston moves downward and makes piston electrode 9 to the distance of central electrode 3 surpass its effective voltage striking distance, spark plug has stopped discharge, and no electric arc produces, and the igniting of spark plug is invalid igniting in this process.Certainly, safer for making internal combustion engine in the invalid igniting of spark plug time work, can add the signal that an invalid igniting finishes and give oil spout ECU, commencement of fuel injection just when ECU receives the signal that the invalid igniting of spark plug finishes makes its work more reliable and secure.

In different internal combustion engines, cylinder bore varies in size, and is also different to the space size that spark plug is installed, therefore, volume requirement to spark plug is also different, and the highest high direct voltage piezoelectric voltage that spark plug bears at work is also different, and the breakdown voltage rating value of bearing is also different.

The breakdown voltage rating value of described spark plug is meant that spark plug is installed on the cylinder head, in maximum temperature, maximum pressure and the minimum temperature that internal combustion engine produces in the cylinder at work, the temperature and pressure changing environment of minimum pressure, the magnitude of voltage of breakdown current does not take place to the highest high direct voltage piezoelectric voltage that can bear between cylinder block and other part (except the piston electrode 9) at the central electrode 3 of spark plug.Spark plug is at work when preventing piston movement travel no show appointed positions, breakdown current takes place in 3 pairs of cylinder block of the central electrode of spark plug or other part (except the piston electrode 9), produce the electric arc mis-ignition, this is unallowed, the place according to the full aduance of internal combustion engine needs the highest needed dc high-voltage magnitude of voltage can only the breakdown voltage rating value of spark plug 80% with interior work, safe and reliable to guarantee it.

Described high direct voltage piezoelectric voltage is by computer-controlled, control system shown in Figure 3 is the control system of four-cylinder internal combustion engine, it comprises computer computer and interface thereof, transducer, the secondary winding of the ignition coil of ac high-voltage piezoelectric voltage is stablized in output, the elementary winding of scalable and control ignition coil and control the frequency of its conducting and disconnection and the triode Q1 of electric current, Q2, Q3, Q4, rectification and filtered diode D1, D2, D3, D4, store high direct voltage electric energy capacitor C 1, C2, C3, C4, detect electric current required when lighting a fire, time is also judged the coil L1 whether spark plug breaks down, L2, L3, L4, ignition transformer T1, T2, T3, T4, computer is the core of this system, there is monitoring in its rom memory and checks oneself the data of program and the various Optimization of operating ignition advance angles of this vehicle, CPU detects judgement to its operating mode, search optimum igniting and draw anterior angle, the control ignition coil is exported corresponding high-tension electricity voltage.

Behind engine starting, computer receives that internal-combustion engine rotational speed reaches the signal that requires of lighting a fire and promptly reads the starting ignition data, the conducting and the disconnection of calculating and exporting adjustable high-frequency digital voltage Waveform Control Q1, Q2, Q3, Q4, the electric current of the elementary winding of control ignition coil, secondary coil is exported adjustable stable AC high voltage, AC high voltage becomes the high direct voltage piezoelectric voltage after by rectifier diode and stores respectively in C1, C2, C3, C4, ignition coil V1, V2, V3, V4 export its voltage, and will detect voltage and give computer and monitor.The signal that computer also receives each transducer simultaneously and detected, and it is carried out COMPREHENSIVE CALCULATING, as detected one all required time of internal combustion engine rotation of speed probe with by L1, L2, required time of the detected igniting of L3, L4, best advance angle when COMPUTER CALCULATION goes out each cylinder igniting, thereby adjust the size of high direct voltage piezoelectric voltage, spark plug is lighted a fire in the optimum igniting advance angle.

It only is preferred embodiment of the present utility model that above institute is chatted, certainly, the positive pole of described DC high-voltage power supply also can be electrically connected to piston electrode 9, its negative pole then is electrically connected to central electrode 3, all equivalences of doing according to the described structure of the utility model claim, feature and principle change or decorate, and are included in the utility model claim.

Claims

1, a kind of spark plug of high direct voltage voltage perforation ignition, it comprises body shell (1), insulator (2), the lower end outer rim of body shell (1) forms thread (5), insulator (2) is socketed on the body shell (1), it is characterized in that: described spark plug also comprises central electrode (3) and electric conductor (4), central electrode (3) and electric conductor (4) are installed on the center of insulator (2), also be provided with a conductor glass (6) in the described insulator (2), the two ends of conductor glass (6) electrically connect with central electrode (3) and electric conductor (4) respectively, the other end of central electrode (3) then extends to insulator (2) lower end, the both positive and negative polarity of DC high-voltage power supply respectively with central electrode (3) and cylinder on piston electrode (9) electrically connect.

2, the spark plug of high direct voltage voltage perforation ignition according to claim 1 is characterized in that: the metal electrode of described piston electrode (9) for being installed on piston face (20) and cooperating with central electrode (3).

3, the spark plug of high direct voltage voltage perforation ignition according to claim 1 is characterized in that: the bottom portion that described insulator (2) is equipped with central electrode (3) forms at least one circle flange (12).

4, the spark plug of high direct voltage voltage perforation ignition according to claim 1 is characterized in that: described insulator (2) is provided with connector lug (8) with the end that DC high-voltage power supply electrically connects.

5, the spark plug of high direct voltage voltage perforation ignition according to claim 1, it is characterized in that: described insulator (2) is provided with inner washer (11) and sealing ring, and inner washer (11) and sealing ring are installed on the socket place of insulator (2) and body shell (1) respectively.